'From Poop to Potable'

Years ago (like 30 give or take 10) in Detroit there was a demonstration of such a device.. Turns out they mixed like 1 glass of sewage with something on the order of 100 Gallons of fresh water (or more) and that is how they did it.

Not really purification (You can purify but I am not sure how good a job outside of small amounts in a lab) but dilution.

I wonder if that is what is happening here.